A brief discussion on the structure of anechoic chamber_Century Wisdom (Suzhou) Testing Technology Co., Ltd

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A brief discussion on the structure of anechoic chamber

Release time:

2022-06-15 00:00

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　　There are many new products and equipment appearing around us. With the development of science and technology, there is more and more radiation around us, the use of electronic equipment will also produce radiation, the radiation has a great impact on our health, so we must take measures to block the radiation. The use of anechoic chamber can not only block radiation, but also reduce the interference to us. The function of the radio anechoic chamber is the same as our shielding room. Let's first understand the main structure of the radio anechoic chamber.

　　What is the structure of the anechoic chamber? Let's take a look at it.

　　The main components of anechoic chamber are shielding chamber and absorbing materials. The shielding chamber is composed of shielding shell, shielding door, ventilation waveguide window and various power filters. The shield shell can be used as welded or prefabricated structure depending on the user's requirements. The absorbing material is composed of a single layer ferrite sheet with working frequency range of 30MHz~1000MHz and a conical carbon sponge absorbing material. The conical carbon sponge absorbing material is permeated into the carbon solution by polyurethane foam and has good flame retardant performance.

　　What are the characteristics of anechoic chamber? Let's take a look at it. The anechoic effect of the anechoic chamber is to prevent the interference of external electromagnetic waves, prevent the measurement activities from being affected by the external electromagnetic environment, prevent the test signal from being interfered by external radiation, pollute the electromagnetic environment, and cause interference to other electronic equipment.

　　What are the characteristics of the anechoic chamber? Let's take a look at it.

　　1. Companies, enterprises or testing institutions can design frequency range and static area characteristics of the anechoic chamber according to needs. The frequency range of the radio anechoic chamber is not as specific as that of the electromagnetic compatibility test anechoic chamber. The static region characteristics, standing wave properties, the reflectance of the absorbing materials in the anechoic chamber are higher than those in the electromagnetic compatibility test anechoic chamber. Especially for low sidelobe antennas, the antennas with different requirements need to be attached with scientific calculation design, scientific selection and appropriate absorption materials.

　　2. There are no strict requirements for electromagnetic shielding. Some do not need to design a separate shield, directly on the wall to paste absorbent material can be. Using building walls and absorbing materials, the shielding and absorbing effects of electromagnetic waves can be used to meet the requirements. Of course, what is the electromagnetic environment of building a darkroom? Even if the electromagnetic environment is different, the requirements are not the same. If the electromagnetic environment around the precast darkroom is not good, which may affect the test result, or the radiation power during the test is very high, which may affect the surrounding electromagnetic environment, an appropriate shield should be made for shielding.

　　What is the performance test of anechoic chamber? Let's take a look at it.

　　The performance of the antenna used in testing the anechoic chamber should be similar to that intended for future testing in the anechoic chamber. Test results may vary greatly if different antennas are used for radio darkroom tests (e.g. antenna valve widths vary). The results of narrow-lobe antenna test are better than those of wide-lobe antenna test. That means passing the narrow valve antenna test. Tests with wide valve antennas may not pass muster. Therefore, when bidding for a darkroom, the type of test antenna to be used for darkroom testing (e.g. including transceiver antennas) should be specified in advance to avoid unnecessary disputes during darkroom acceptance.

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